Can we create trigger on SQL Server?

Can we create trigger on SQL Server?

SQL Server Triggers on Views There are two kinds of DML triggers the FOR (or AFTER) trigger and the INSTEAD OF trigger, but the only one you can use with views are INSTEAD OF triggers. In contrary to the AFTER type which fires after an event, the INSTEAD OF trigger executes instead of the firing statement.

Why we use instead of trigger in SQL?

An INSTEAD OF trigger is a trigger that allows you to skip an INSERT , DELETE , or UPDATE statement to a table or a view and execute other statements defined in the trigger instead. The actual insert, delete, or update operation does not occur at all.

Can you create the following trigger before or after update trigger for each row Yes No?

a before trigger can modify the :new values. you can have many before triggers — each modifying the :new values. That entire referenced thread was the proof that you cannot be sure the trigger is fired only once for each row!

What is an INSTEAD OF trigger in SQL?

An INSTEAD OF trigger is a trigger that allows you to skip an INSERT, DELETE, or UPDATE statement to a table or a view and execute other statements defined in the trigger instead. The actual insert, delete, or update operation does not occur at all. In other words, an INSTEAD OF trigger skips a DML statement and execute other statements.

What is the use of instead of update in SQL?

INSTEAD of UPDATE Triggers in SQL Server The SQL INSTEAD OF UPDATE trigger will fire before the execution starts. So, you can use this SQL Server INSTEAD OF UPDATE trigger to pass the value for Identity Columns or Updating different tables, etc.

Can I disable the UPDATE/INSERT trigger before update?

I know I can disable trigger before UPDATE and then enable the trigger after UPDATE : But this disable and enabling trigger will affect all users logged in currently. So there is a possibility that another user run an UPDATE/INSERT while the trigger is disabled by my script which is not good.

How do I update a temporary table in a trigger?

Your trigger should perform a check for a temporary table. If the temporary table exists, the trigger should know to end and not perform the actions. In the update statement you want to perform, create the temporary table first.